#! /usr/bin/env python3

# Configuration file for the Sphinx documentation builder.
#
# This file does only contain a selection of the most common options. For a
# full list see the documentation:
# http://www.sphinx-doc.org/en/master/config


# -- Path setup --------------------------------------------------------------

import os
import re
import sys
from typing import List

base_path = os.path.abspath(os.path.join(__file__, "..", "..", ".."))
# read module from src instead of installation
sys.path.insert(0, base_path)

print("base path for Captum module:", base_path)

# -- Project information -----------------------------------------------------

project = "Captum"
copyright = "2019, Facebook, Inc."
author = "The PyTorch Team"

# import captum from base_path to get the version
# but the version is no longer used
# since version is trimmed in sphinx pages to embed into docusaurus
import captum  # noqa: E402

version = captum.__version__


# -- General configuration ---------------------------------------------------

# Sphinx extension modules
extensions = [
    "sphinx.ext.autodoc",
    "sphinx.ext.napoleon",
    "sphinx_autodoc_typehints",
    "sphinx.ext.doctest",
    "sphinx.ext.todo",
    "sphinx.ext.coverage",
    "sphinx.ext.ifconfig",
    "sphinx.ext.viewcode",
    "sphinx.ext.intersphinx",
    "sphinxcontrib.katex",
]

# Add any paths that contain templates here, relative to this directory.
templates_path = ["_templates"]

# The suffix(es) of source filenames
# source_suffix = [".rst", ".md"]
source_suffix = ".rst"

# The master toctree document.
master_doc = "index"

# The language for content autogenerated by Sphinx.
language = "en"

# List of patterns, relative to source directory, that match files and
# directories to ignore when looking for source files.
# This pattern also affects html_static_path and html_extra_path.
exclude_patterns = []

# The name of the Pygments (syntax highlighting) style to use.
pygments_style = "sphinx"

# Default options for autodoc directives. Applied to all autodoc directives
autodoc_default_options = {}

# Inlcude init docstrings into body of autoclass directives
autoclass_content = "both"

# Preserve signature defaults
# Prevents entire tensors from being printed, & gives callable functions
# proper names
autodoc_preserve_defaults = True

# Configuration for intersphinx: refer to the Python standard library and PyTorch
intersphinx_mapping = {
    "python": ("https://docs.python.org/3", None),
    "pytorch": ("https://pytorch.org/docs/stable", None),
}


# -- Options for HTML output -------------------------------------------------

# The theme to use for HTML and HTML Help pages.  See the documentation for
# a list of builtin themes.
html_theme = "alabaster"

# Theme options are theme-specific and customize the look and feel of a theme
# further.  For a list of options available for each theme, see the
# documentation.
html_theme_options = {}

# Add any paths that contain custom static files (such as style sheets) here,
# relative to this directory. They are copied after the builtin static files,
# so a file named "default.css" will overwrite the builtin "default.css".
# html_static_path = ["_static"]
html_static_path = []  # for now we have no static files to track

# Custom sidebar templates, must be a dictionary that maps document names
# to template names.
#
# The default sidebars (for documents that don't match any pattern) are
# defined by theme itself.  Builtin themes are using these templates by
# default: ``['localtoc.html', 'relations.html', 'sourcelink.html',
# 'searchbox.html']``.
#
# html_sidebars = {}

# If true, "Created using Sphinx" is shown in the HTML footer. Default is True.
html_show_sphinx = False

# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True.
html_show_copyright = False

# If true, the reST sources are included in the HTML build as _sources/name.
# The default is True.
# Uncomment the following line after sphinx 4.5.0 release
# https://github.com/sphinx-doc/sphinx/issues/9456
# html_copy_source = False

# -- Options for HTMLHelp output ---------------------------------------------

# Output file base name for HTML help builder.
htmlhelp_basename = "captumdoc"


# -- Options for LaTeX output ------------------------------------------------

latex_elements = {
    # The paper size ('letterpaper' or 'a4paper').
    #
    # 'papersize': 'letterpaper',
    # The font size ('10pt', '11pt' or '12pt').
    #
    # 'pointsize': '10pt',
    # Additional stuff for the LaTeX preamble.
    #
    # 'preamble': '',
    # Latex figure (float) alignment
    #
    # 'figure_align': 'htbp',
}

# Grouping the document tree into LaTeX files. List of tuples
# (source start file, target name, title,
#  author, documentclass [howto, manual, or own class]).
latex_documents = [
    (master_doc, "captum.tex", "Captum Documentation", "Facebook, Inc.", "manual")
]


# -- Options for manual page output ------------------------------------------

# One entry per manual page. List of tuples
# (source start file, name, description, authors, manual section).
man_pages = [(master_doc, "captum", "captum Documentation", [author], 1)]


# -- Options for Texinfo output ----------------------------------------------

# Grouping the document tree into Texinfo files. List of tuples
# (source start file, target name, title, author,
#  dir menu entry, description, category)
texinfo_documents = [
    (
        master_doc,
        "captum",
        "Captum Documentation",
        author,
        "Captum",
        "Model interpretability and understanding for PyTorch.",
        "Miscellaneous",
    )
]


# -- Options for Epub output -------------------------------------------------

# Bibliographic Dublin Core info.
epub_title = project

# The unique identifier of the text. This can be a ISBN number
# or the project homepage.
#
# epub_identifier = ''

# A unique identification for the text.
#
# epub_uid = ''

# A list of files that should not be packed into the epub file.
epub_exclude_files = ["search.html"]


# -- Extension configuration -------------------------------------------------

# -- Options for todo extension ----------------------------------------------

# If true, `todo` and `todoList` produce output, else they produce nothing.
todo_include_todos = True


# -- Docstring Improvements --------------------------------------------------


# Regex code for typing replacements.
# The "(?<![\.])" part checks to see if the string
# starts with a period, and "\b" denotes word boundaries.
# Only words that don't start with a period are replaced.
_rt = [r"(?<![\.])(\b", r"\b)"]


def autodoc_process_docstring(
    app, what: str, name: str, obj, options, lines: List[str]
) -> None:
    """
    Modify docstrings before creating html files.
    Sphinx converts the 'Args:' and 'Returns:' sections of docstrings into
    reStructuredText (rST) syntax, which can then be found via ':type' & ':rtype'.

    See here for more information:
    https://www.sphinx-doc.org/en/master/usage/extensions/autodoc.html
    """
    for i in range(len(lines)):
        # Skip unless line is an parameter doc or a return doc
        if not lines[i].startswith(":type"):
            continue
        if ":py:data:" in lines[i]:
            continue

        # Ensure Any, Callable, & Iterator types are hyperlinked with intersphinx.
        # The tilde '~' character hides the 'typing.' portion of the string.
        lines[i] = re.sub(_rt[0] + r"Any" + _rt[1], "~typing.Any", lines[i])
        lines[i] = re.sub(_rt[0] + r"Callable" + _rt[1], "~typing.Callable", lines[i])
        lines[i] = re.sub(_rt[0] + r"Iterator" + _rt[1], "~typing.Iterator", lines[i])
        lines[i] = re.sub(_rt[0] + r"Iterable" + _rt[1], "~typing.Iterable", lines[i])

        # Ensure Tensor type is hyperlinked by interpshinx
        lines[i] = re.sub(_rt[0] + r"Tensor" + _rt[1], "~torch.Tensor", lines[i])


def setup(app) -> None:
    app.connect("autodoc-process-docstring", autodoc_process_docstring)
